Measuring-pump.



J. J. HOTGHKISS, MEASURING PUMP.

APPLICATION IIILED SEPT.23.1913.

1,1 17,052, Patented Nov. 10, 1914.

Inventor Witnesses Attofneys JOSEPH J. HOTCHKISS, OF RALEIGH, NORTH CAROLINA.

- MEASURING-PUMP.

Specification of Letters Patent. I

Application filed September 23, 1913. Serial No. 791,863.

To all whom it may concern:

Be it known that 'I, JOSEPH J. HOTCH- KISS, a citizen of the United States, residing at Raleigh, in the county of Wake and State of North Carolina, have invented a new and useful Measuring-Pump, of which the following is a specification.

This invention relates to improvements in measuring pumps.

. sitioned upon the outer periphery thereof.

An object of the present invention is to rovide a measuring pump including a cylinder with iston reciprocatingly mounted therein, and above which is positioned a rack bar and a gear segment for the actua= tion thereof. p

A- still further object of the invention is to provide a rotatable drum with stops poand helically arranged therearound and with means whereby the said drum may be rotated to bring the said stops into the path of movement of parts connected with the piston, and to further provide the said drum with a plurality of notches'and a pawl engageable therewith so'that the drum will be brought to a sudden stop as each projection or stop of the drum rotates into the path of movement of the rack bar.

proceeds, the invention resides in the combination and arrangement of parts and in With the foregoing and other objects in view which will appear as the description the details of construction hereinafter described and claimed, 'it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is cla med without departing from the spirit of the invention.

In the drawings accompanying this speci-- fication and forming a part thereof, the preferable form of my invention is illustrated, in which Figure l is a view in elevation of my. improved measuring pump, parts thereof therefrom. Fig. 6 is t fragmental view in section through the lower part of the drum. The segment 20 is rotated out of contact with the rackbar allowing the latter to move forward with the result that the teeth of the rack bar are engaging the front extremity of the slot through which'the rack bar slides.

' Referring to the drawings in which simi-- Patented ov. 10, 1914.

lar reference numerals indicate corresponding parts of the several views, the wall plate 7 is provided with an outwardly extending shelf 8 and upon which is mounted the mechanism of my improved measuring pump.

The cylinder 9 is. provided with a tapering portion 10 and in which are mounted the ball valves 11 and 12 of difierent diameters and which act in the capacitjfof checks for the liquid after it has passed into the cylinder through the inlet (pipe i 13. An outlet flap valve 14 is provide allowing the liquid to pass out through the outlet pipe 15 as the piston 16 is driven' downwardly in the cylinder and maintain ing a vacuum within the cylinder upon'the up-strok'e of the said piston.

The above construction is such that a reciprocation of the piston within the cylinder 9 raises the liquid through the inlet pipe 13 past the ball check valves lland 12 and through the apertured plate 17 and into the body of the cylinder. A down-stroke of the piston forces the li uid out through the flap valve 14 and to the delivering or outlet pipe 15. below which a receptacle may be positioned. The area of the piston remaining constant, the amount of liquid delivered -b the pump during each reciprocation or complete stroke of the piston depends upon, and is functional of the The stroke controlling drum 22 is rotav tably mounted adjacent the rack bar 19 at its lower extremity :by the outwardly ex-' tending bracket 23 and at its upper extremity by the curved bell crank. shaped bracket 2-4. The brackets 23 and 24 are each provided with the arms 25' which are provided with suitable slots 26 therein and through which extends the rack bar 19 which isfor rectilinear reciprocation thereby. It will be noted from reference to Figs. 2 and 6, that the slots 26 are of sufficient size to accommodate the said rack bar and allow the teeth to pass thcrethrough without interference therefrom. It being noted that the gear 20 which 'is in constant mesh'with the rack bar forces the smootli portion of the rack bar against the side walls of the slots and prevents the teeth from coming in contact therewith which would end to lock the piston against reciprocation. In this connection however, it is to be noted that the segmental gear 20 is of such a size that it can rotate to such a point that the teeth thereof can be rotated out of mesh with the teeth of the rack bar, in which instance, the 'rack'bar, due to the resiliency of the piston rod 18 will move forwardly against the front of i the slot with the result that the teeth lock segmental gear, also allowing for the com-.

therewith and hold the piston in the posi tiom'assumed when disconnected from the Elete removing thereof from the cylinder itsodesire/ The stroke controlling rotatable drum 22 isprovidedat its upper and lower extremities with overhanging bases 27 and 28. A plurality of stops ,29are rigidly'secured to the outer surface of the drum and olfset one with respect to the other in both a horizon-- tal and vertical manner so as to wind helically thereabout.

As illustrated'in Fig. 5, the rack bar 19 is provided with the projecting arms 30 extending therefrom and the path of movement of which is intersected by the successive stops 29 and the overhanging base 27, so that the length of stroke of the rack bar 19 is limited in a downward direction by one of the stops 29 which happens to be in the path of movement thereof. The stop 30 is of limited dimensions and does not strike the overhanging base 27 during the removal of the piston, it bein noted that the segmenrack bar during such procedure which allows the entire rack bar to move forward as i is the spring pawl 34 which is adapted to resiliently seat in the said notches and hold the drum against accidental rotation. Thus as the handle 31 is actuated, the drum will .trolled pawl resiliently seatin be rotated, unseating the pawl from one of the notches until the pawl comes into regis tration with some other notch into which it immediately springs and greatly increases the ressure necessary for further rotation of t e drum, automatically informing the operator that one of the lugs has been properly positioned within the path of movement of the offset arm 30 and will roperly limit the downward motion thereoi An indicator is marked upon the surface of, the drum opposite each of the stops 29 and, which stops are so spaced that a standard quantity or volume of liquid will be expelled from the piston when the rack bars projecting arm is r'eciprocated between the overhan ing base 27 and one of the various stops. i is to be noted that'the stops do not extend entirely around the stroke controlling drum so that the said drum may be brought into a position whereby the free reciprocation of the piston may take place when it is desired 1. In a measuring pump, the combinations;

of a ump portion, a piston rod extending there rom, means for reciprocating said piston rod, an arm projecting from said pistonfrod and carried thereby, a rotatable drum mounted adjacent the said piston rod,.

the said drum provided with overhanging bases, one of said bases adapted to limit the movement of said piston rod in one direction, a plurality of helically' arranged stops projecting from the surface of said drum and adapted to limit the reciprocation of said piston rod manually o erablc han le secured to said drum a {M a ted to rotate the same, one of said bases of t e drum provided with a plurality of notches therein, and a spring conwithm the said notclies, the said pawl an notches coacting to hold one of the steps of the drum in the line of movement of the .piston rod anm A 2 A device of the class described including a pump comprising a resilient piston rod, a rack bar carried by said piston rod, 9. segmental gear meshing with said rack bar in the o positedirection, a

and adapted to rotateout of contact therewith, brackets provided with slots therein for the reception and guidance of said rack bar, said rack bar held against the rear portiohs of said slots by said segmental gear when in contact therewith, the said rack bar adapted by the resiliency of the piston rod to move into contact with the forward portions of said slots when the said segmental gear is rotated out of mesh -therewith.

3. An apparatus of the class described comprising a. pump having a resilient piston rod, 9. reek bar carried by the piston rod. thereof, a segmental gear meshing with said rack bar and adapted to rotate out of contact therewith, means for siidabiy mounting said rack bar, said rack bar adapted to be forced forwardly into inter-tacking engagement with the said means whereby the rack bar is slidably mounted. owing to the resiliency of said piston rod, when the said segmental gear is rotated out of engagement u: therewith.

In testimony that I claim the foregoing as my own I have hereto :xfiixed my signz ture in the presence of two witnesses.

Witnesses J. T. BLAND, J. P. MULLIKIN. 

